import {createApp} from 'vue'
import App from './App.vue'
import router from './router'
import store from './store'
// 1.引入element-plus组件库
import ElementPlus from 'element-plus'
import 'element-plus/dist/index.css'
// 3.引入element-plus图标库
import * as ElementPlusIconsVue from '@element-plus/icons-vue'

//8.1 配置根路径
const BASE_URL = 'http://localhost:8080';
// window里配置的都是全局变量，可以在任意script标签内使用
window.BASE_URL=BASE_URL;

const app = createApp(App)
//8.2 给app也配置全局路径，方便后续在template中的使用
app.config.globalProperties.BASE_URL=BASE_URL;

// 4.遍历ElementPlusIconsVue对象中所有的图标组件并注册到app中
for (const [key, component] of Object.entries(ElementPlusIconsVue)) {
    app.component(key, component)
}
//5.修改elementPlus默认中文
import zhCn from 'element-plus/dist/locale/zh-cn.mjs'


// 2.给vue实例使用ElementPlus组件库
app.use(ElementPlus, {locale: zhCn}).use(store).use(router).mount('#app')
const debounce = (fn, delay) => {
    let timer = null;
    return function () {
        let context = this;
        let args = arguments;
        clearTimeout(timer);
        timer = setTimeout(function () {
            fn.apply(context, args);
        }, delay);
    }
}
const _ResizeObserver = window.ResizeObserver;
window.ResizeObserver = class ResizeObserver extends _ResizeObserver {

    constructor(callback) {
        callback = debounce(callback, 16);
        super(callback);
    }
}
//7.配置获取当前登录用户的全局方法
window.getUser=()=>{
    //如果获取到了用户数据，转回为js对象
    //如果获取不到用户数据，Boolean('')是false,得到null
    return localStorage.user ? JSON.parse(localStorage.user):null;

}